Research firm IDC expects Microsoft to gain ground in the crowded tablet business over the next few years, with Windows-based devices projected to have roughly 10 percent market share by 2016. That would still represent only a small sliver of the market. iPads will constitute nearly half the market, while some 40 percent will consist of Android-based tablets, IDC projects. But it would be an improvement over what Microsoft has seen in smartphones since it introduced the Windows Phone.